crates.io release 0.2.5

* Publish version 0.2.5 with updated tombstone README and metadata.

crates.io release 0.2.4

* Tombstone README (no code changes)

crates.io release 0.2.3

* Enable building with stable-channel compiler.

crates.io release 0.2.2

* Make `any()` and `all()` work for ARMv7+NEON